As competition rises in the Keytruda (pembrolizumab) biosimilar space, Celltrion Inc. is the latest to announce that it filed an IND application to the U.S. FDA to start a global phase III trial for its own Keytruda biosimilar, dubbed CT-P51. Incheon, South Korea-based Celltrion, which previously said it would differentiate from the pack by developing an easier-to-administer subcutaneous biosimilar of pembrolizumab, announced June 17 plans to start a global comparative phase III study of CT-P51 and Keytruda.

In lieu of pending guidance, the U.S. FDA’s approval May 20 of Biocon Biologics Ltd.’s Yesafili and Samsung Bioepis Co. Ltd.’s Opuviz as interchangeable biosimilars to Regeneron Pharmaceuticals Inc.’s Eylea (aflibercept) provides further insight into how the agency is approaching the market exclusivity the Biologics Price Competition and Innovation Act awards to the first approved interchangeable for any given biologic.

With round 1 not yet completed, the U.S. Centers for Medicare & Medicaid Services (CMS) already is prepping for round 2 of the Medicare negotiations mandated by the 2022 Inflation Reduction Act. While the negotiation process will expand to Part B drugs in the future, round 2, like the first cycle, will be limited to single-source Part D drugs that account for some of the highest Medicare expenditures. However, the number of drugs selected for the next cycle could grow from the current 10 to up to 15

The U.S. FDA issued a revised draft guidance, “Promotional labeling and advertising considerations for prescription biological reference and biosimilar products,” to help ensure promotional communications involving reference biologics or their follow-ons are accurate, truthful and not misleading.